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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba1d41fc7ffe5c9e80df57589461a1d58bbfe481b18f194af962f37e4fbf1ba' 
  AND token = 'gYyVSXxWCNyvhOZFtwirg62EizvuSwf/eaNVRCVn2Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}